"Jokei Kazoku III: Himitsu" is an erotic thriller OVA about a man sent to an island to persuade four heiresses to relinquish their claim to their late father’s fortune, where secrets, revenge, and violent sexual manipulation drive a tense struggle for power. The story—based on an eroge by Silky’s—mixes psychological twists with explicit incestuous and non-consensual sexual content as the protagonist’s hidden agenda and the heiresses’ dark motives collide.